NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T08:46:14 PDT
Help | Comment | NED Home

For refcode 2004A&A...426..481K:
Retrieve 1 NED object in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2004A&A...426..481K The twin-jet system in NGC 1052: VLBI-scrutiny of the obscuring torus M. Kadler, E. Ros, A. P. Lobanov, H. Falcke and J. A. Zensus Received 8 April 2004 / Accepted 8 July 2004 NGC 1052 offers the possibility to study the obscuring torus around a supermassive black hole, predicted by the standard model of active galactic nuclei, over a wide range of wavelengths from the radio to the X-ray regime. We present a detailed VLBI study of the parsec-scale structure of the "twin-jet" system in NGC 1052 in both total and polarized intensity and at multiple frequencies. We report the detection of linearly polarized emission from the base of the eastern jet at 5 GHz. While the radio spectrum in this region might be still consistent with synchrotron self absorption, the highly inverted spectrum of the western jet base represents a clear sign of pronounced free-free absorption in a circumnuclear torus. We observe an abrupt change of the brightness temperature gradient at a distance of ~ 0.2 pc to 0.3 pc east of the central engine. This might provide an observational signature of the edge of the central torus, where the transition from an external pressure-dominated jet regime to a more or less freely expanding jet takes place. We determine the absorbing column density towards the western jet core to be ~ 2.2 x 10^22^ cm^-2^ in good agreement with the values derived from various X-ray observations. This suggests that the nuclear X-ray emission and the jet emission imaged by VLBI originate on the same scales. Keywords: galaxies: individual: NGC 1052, galaxies: individual: PKS B0238-084, galaxies: active, galaxies: jets
Retrieve 1 NED object in this reference.
Please click here for ADS abstract

Back to NED Home